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A number of years ago a friend of mine used a program (I believe it was DOS based) where you could set up a completely custom solar system with custom orbits, planets, suns, object mass, speed, etc and I have looked for that program of something similar off and on in the past years. Has anyone heard of this program or something similar?

scvhost.exe! one of them uses a lot of CPU!!! When i end the process the cpu speed returns to 2/3/4%, and my computer works much faster. But then, when i go to play sim city 4... it doesnt work at all? what can i do?